SuperToothZ004109E&nbsp;Disco2 A2DP Bluetooth Stereo Speaker - Retail Packaging - Black Bluetooth version 4.0 Operating range : 10 meters High volume: 3 to 4 hours Medium volume: 10 hours Stand-by time: 1,500 hours Compatible with all other phones, PCs, and MP3 players that support Bluetooth A2DP. Bluetooth version 4.0^Operating range : 10 meters^High volume: 3 to 4 hours Medium volume: 10 hours^Stand-by time: 1,500 hours^Compatible with all other phones, PCs, and MP3 players that support Bluetooth A2DP.